Variometer



j. W. DORON.

VARIONIETER.

APPLICATION FILED FEB. I4, I92I.

Patented Mar. 7, 1922.

UNITED STATESl PATENT OFFICE.

JOSEPH W. BORON, OF HAMILTON, OHIO, ASSIGNOR OF ONE-HALF TO SHULER W DORON, OF HAMILTON, OHIO.

VARIOMETER.

To all whom t may concern.'

Be it known that I, JOSEPH W. D oRoN, a citizen of the United States, and resident of Hamilton, in the county of Butler and State' lvices which are known as variometers and which are employed for the purpose of varying the inductance in wireless telephone and telegraph circuits. The invention contemplates the provision of a device of this type that is of sturdy construction, which may be economically manufactured and which is more efficient than similar devices heretofore produced. The device hereinafter described, and subsequently claimed, is particularly characterized by the extremely small air gap between the stationary and movable coils and by the fact that only an extremely small portion of each coil lies in contact with the material of the framework supporting it.

Other advantages of the variometer of my invention will appear as the following detailed description progresses.

In the accompanying drawing wherein 1 have illustrated one embodiment of my in'- vention,

Figure 1 is a side elevational view of the variometer.

Figure 2 is a top plan View thereof.

Figure 3 is a vertical sectional view taken on the line 3 3 of Figure 2, and

Figure 4 is a horizontal sectional view taken on line 4--4 of Figure 1.

Similar characters of reference refer 'to similar parts throughout the several views.

The device comprises an outer stationary coil support and an inner movable coil support. The outer support comprises the upper and lower rings indicated at 10 and 11, respectively, each of which is provided with a plurality of peripheral ears 12-12. If desired, a pair of the ears of each ring may be conformed to provide brackets wherewith to mount the variometer on a panelboard or other suitable support as indicated in Figure 2. Sleeves 12?--12l are interposed between the ears of the upper and lower rings and bolts 12"?12b extend through said sleeves Specification of Letters Patent.

Application led February 14, 1921.

Patented Mar. *7, 1922.

Serial No. 444,917.

and said ears to fasten the upper and lower rings together. It will be understood that the herein illustrated means for supporting the variometer is purely representative and may, of course, be varied within wide limits.

Formed integral with or otherwise attached to each of the rings 10 and 11, is a bridge 13 which is apertured at its central point to receive one of the bearings 14-14 for the shaft 15.

The inner coil support is'in the form of a spool which comprises the discs 16 and 17 which are spaced from each other by sleeve 18. and are keyed or otherwise fixed upon shaft 15.

Rings 10 and 11, bridges 13, discs 16 and 17 and sleeve 18 are conveniently and preferably formed of non-conducting material; the other parts of the device may be formed of metal or other suitable material.

It will be noted that the discs 16 and 17 of the innei coil support are beveled at 19, the annular beveled surfaces thus provided being complementary to but spaced slightly from the annular bexieled surfaces 2() of the rings 10 and 11. The distance between each beveled surface 19 and its opposing beveled surface 20 is preferably just slightlyv greater than the diameter of the wire of which the several turns of the inner coil are formed. 1t will be noted that the upper ring 10 of the outer support is provided with four upwardly projecting peripheral beads 21 and that the lower ring 11 is provided with corresponding` similarly positioned downwardly projecting beads which have been designated by the same reference numerals.

The outer coil consists of two sections A and B, said outer coil sections lying on opposite. sides of the axis of shaft 15 and upon opposite sides of the bridges 13-13. Although supported solely by the rings 10 and 11, it will be noted that the several turns of the outer coil engage the material of said rings only at their peripheries and at the beads 21-21. The inner coil comprises the sections C and D which, like the corresponding sections of the outer coil, are disposed on opposite sides of the axis of shaft 15. The several turns of the inner coil are carried solely by the discs 16 and 17 but it will be noted that the several turns ofthe inner coil Contact with said discs only at the beveled surfaces 19 and at the exprisingapair of spaced, relatively fixed, and

tremely narrow peripheral surfaces of said discs.

So far as my present invention is concerned, the inner and outer coils may be connected inside of the variometer or may be provided with separate terminals by means of which the proper electrical connections can be made. In the drawings I have indicated the usual series circuit relation between the inner and outer coils. Corresponding ends of the inner coil sections C and D are electrically connected together and the other ends of sald inner coil sections are led to corresponding ends of the outer coil sections A and B. The other ends of the outer coil sections may be led to the upper ends of two of the bolts which secure the outer coil Support together, said bolts and their (zo-operating nuts servingr as terminals wherewlth proper circuit connections may be made with the variometer. The wires which afford electrical connection between the inner and outer. coil sections are conveniently turned once or more around the shaft, as is clearly indicated in Figure 3, this being an expedient often used in other variometer constructions.

The shaft l5 is conveniently provided with an operating knob 22 and with a pointer 24 which Ymoves over a suitable scale 28. If desired, the dial may be provided with stops 25 which, by their co-operation with the pointer, limit the range of movement of theinner coils to an arc .of 180, this range being all that is necessary in order that the relation of the coils may be changed from turns in parallel to turns at right angles and then to the opposite position with turns in parallel.

It will be understood that I do not, in any Way, limit myself to the particular arrangement and construction of parts herein shown and described, but wish to secure to myself, all equivalent constructions coming within the terms or spirit of the ap-.

pended claims.

What I claim is new and desire to secure by Letters Patent of the United States, is 1. In a variometer, an outer support comprising a pair of spaced, relatively fixed and concentrically disposed rings, an inner coil support comprising a pair of spaced and relatively fixed circular members, each of which lies immediately adjacent one of the rings of the outer support, and concentric therewith, a coil carried by the outer support and having its several turns passing across each rin and between the rings, a coil carried by t e inner support and having each of its turns passing across each circular member and between said circular members, and means for rotatin one of said supports with respect to the ot er.

2. In a variometer, an outer support cornconcentrically disposed rings,- an inner coil support comprising a pair of spaced and relatively fixed circular members, each 0f which lies immediately adjacent one of the rings of the outer support, and concentric therewith, a coil carried by the outer support and having its several turns passing across each rino and between the rings, a coil carried by tlie inner support and having each of its turns passing across each circular member and between said circular members, and means for rotating one of said supports with respect to the other, each of the circular members of the inner support being provided with an annular beveled coil engaging surface which is complementary to and spaced slightly from a corresponding surface on the adjacent ring of the outer support.

3. In a variometer, an outer support comprising a pair of spaced, relatively fixed and concentrically disposed rings, an inner coil support comprising a pair of spaced and relatively fixed circular members, each of which lies immediately adjacent one of the rings of the outer support, and concentric therewith, a coil carried by the outer support and having its several turns passing across each ring and between the rings, a coil carried by the inner support and having each of its turns passing across each circular member and between said circular members, and means for rotating one of said supports with respect to the other, each of the rings of the outer support being provided with beads which are the only portions of the upper and lower surfaces of the rings which enga e the several turns of the outer coil.

4. n a variometer, an outer support comprising a pair of spaced relatively fixed and concentrically disposed rings, an inner coil support comprising a pair of spaced and relatively fixed circular members, each of which lies immediately adjacent one of the rings of the outer support, and concentric therewith, a coil carried by the outer support and having its several turns passing across each ring and between the rin s, a coil carried by the inner support and aving each of its turns passing across each circular member and between said circular members, and means for rotating one of said and concentric-ally disposed rings, an inner support in the form of a spool disposed with its axis concentric with the centers of said rings and with each of the spool heads lying .immediately adjacent onc of the rings, an outer coil having its several turnsextending across and between said rings, and an inner coil having its several turns extending across and between the heads of said spool.

G. A variometer comprising an outer support comprising a pair of spaced and concentrically disposed rings, bridges carried by said rings and extending across their centers, a shaft journaled in said bridges, a pair of circular members carried by Said shaft, each circular member lying immediately adjajaccnt one of. said rings, an outer coil having its `several turns extending across and between said rings, and an inner coil having its several turns extending-across and between said circular members.

in witness whereof, l hereunto subscribe my name this 8th day of Feb., 1921.

JOSEPH W. DORON.

iVitnesses CrnUs J. Frr'roN, MUniEL EMERICK. 

